泡沫混凝土结构粉化表征及其分析

发布时间：2018-05-27 10:48

本文选题：泡沫混凝土 + 结构粉化　；参考：《武汉理工大学学报》2015年06期

【摘要】：采用铅笔硬度法对泡沫混凝土粉化程度进行了表征,并利用水分蒸发率、SEM、DTG/TG等方法分析了产生粉化的原因。结果表明,泡沫混凝土的铅笔硬度值小于6B时,表明其已产生粉化;低密度泡沫混凝土(小于500kg/m3)容易产生粉化;泡沫混凝土密度越小,早期水分蒸发率越大,24h水分蒸发率超过40%以上时,产生粉化,水分早期快速蒸发是造成泡沫混凝土粉化的原因。泡沫混凝土早期失水使结构疏松,导致CO2更容易侵入而产生碳化,通过分析硬化浆体的CaCO3含量可以分析泡沫混凝土的粉化程度。
[Abstract]:The powdering degree of foamed concrete was characterized by pencil hardness method, and the causes of pulverization were analyzed by means of water evaporation rate and SEM- DTG / TG. The results show that when the pencil hardness of foamed concrete is less than 6B, it has been powdered, and low density foam concrete (less than 500kg / m ~ (3) is easy to be powdered. The smaller the density of foam concrete is, the smaller the density of foamed concrete is. The higher the water evaporation rate in the early stage is, the more the water evaporation rate is above 40% in 24 hours, and the faster evaporation of water is the cause of the pulverization of foamed concrete. The early dehydration of foamed concrete makes the structure loose, which leads to the easier invasion of CO2 and the formation of carbonization. The powdering degree of foamed concrete can be analyzed by analyzing the content of CaCO3 in hardened concrete.
【作者单位】：华南理工大学材料科学与工程学院;
【基金】：广东省重大科技专项(2012A010800026) 广东省科技计划项目(2013B090600056) 国家自然科学基金(51208209)
【分类号】：TU528.2

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